Studies on Techniques of Image Processing and 3-D Reconstruction for Tunnel Construction

• Main Authors: Chung-Pu Wu, 吳崇溥
• Other Authors: Sou-Sen Leu
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/46483875319647655602

碩士 === 國立臺灣科技大學 === 營建工程系 === 88 === At present time “NATM” is the most popular method applied on excavation of rock tunnel domestically. For each rounded cross-section, the way to support tunnels is decided by the records of surveying and mapping site geology, and of rock examination measured with naked eyes. However, with regard to the preserve and examination for geological records, the above way could not be able to combine with the images of actual excavated cross-sections. Besides, the self-examination upon feedback analysis of local design and extraordinary conditions often need to cooperate with actual 3D geological structures to proceed analysis and judgement. As a result, using the traditional method will spend much time on mapping and not be easy to display the actual geology condition. For this reason, we investigated the technology of reconstructing 3D geological structures from continuous rounded cross-sections in order to improve some faults in the present geology records. Moreover, geologists will understand more about the direction of geology weak planes and distribution by observing 3D geological structures. Overall the processes of reconstructing 3D images are divided into 3 steps : (1) image pre-processing ; (2) interpolation ; (3) 3D reconstructing and display. We take photos of excavated cross-section by digital camera and get the characters of weak planes on cross-section by image processing. In addition, we solve the problems of different rounded lengths between neighboring cross-sections by interpolation, and compare merits and defeats of different interpolations. Finally, we use the image data to reconstruct 3D geological structure images separately by volume and surface data. In our study, we provide a better interpolation method to combine the merits of volume and surface data to obtain 3D volume data visually. Continuous rounded geological structures can be showed as 3D images and show distribution of each continuous weak plane. It will help us to predict the geological conditions of next cross-section.